热压Si3N4/MoSi2复合材料的强韧化效果与机制
Toughening Effect and Mechanism of Thermo-compressed Composite Si3N4/MoSi2
摘 要
通过显微组织观察和力学性能测试,对亚微米Si3N4颗粒强韧化MoSi2的效果及其作用机制进行了初步研究和探讨.结果表明:复合材料中的Si3N4颗粒在基体的间层作用,可抑制MoSi2晶粒长大;断口呈现晶粒细小、裂纹扩展曲折和沿晶与穿晶混合型断裂等特征;Si3N4颗粒通过弥散强化和细化晶粒使复合材料强度提高,室温断裂韧度达到8.2 MPa·m1/2,通过晶粒细化、裂纹偏转和分支、微裂纹形成等机制的综合作用使复合材料增韧.
Si3N4
力学性能
强韧化机制
MoSi2-based composite
Si3N4
mechanical property
strengthening-toughening mechanism
Abstract
Sub-micron Si3N4 particles reinforced MoSi2 matrix composites prepared by hot pressing had been studied.Through observation of the microstructure of MoSi2-based composite and the measurement of bending strength,micro-hardness and fracture toughness,the strengthening-toughening mechanism of this material was revealed.It is shown that the strengthening mechanism of the composites is the effect of dispersion strengthening and grain refining,and the toughening mechanism is a synthetic effect in terms of grain refining,micro-crack forming,crack deflection and crack branching.The room fracture toughness of Si3N4/MoSi2 composite is 8.2 MPa·m1/2.
中图分类号 TG148
所属栏目
基金项目 中国博士后基金资助项目(20060400261)
收稿日期 2007/5/8
修改稿日期 2007/9/15
网络出版日期
作者单位点击查看
备注周宏明(1974-),男,湖南茶陵人,副教授,博士后.
引用该论文: ZHOU Hong-ming,YI Dan-qing. Toughening Effect and Mechanism of Thermo-compressed Composite Si3N4/MoSi2[J]. Materials for mechancial engineering, 2008, 32(3): 23～25
周宏明,易丹青. 热压Si3N4/MoSi2复合材料的强韧化效果与机制[J]. 机械工程材料, 2008, 32(3): 23～25
被引情况:
【1】周宏明,柳公器,肖来荣,易丹青, "Si3N4p-SiCw/MoSi2复合材料的强韧化效果与机制",机械工程材料 33, 46-49(2009)
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参考文献
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【3】Mohan G H.Development and characterization of SiC(f):MoSi2-Si3N4(p) hybrid composites[J].Materials Science and Engineering,1999,A261(1/2):24-37.
【4】Sastry S M L,Suryanarayanan R,Jerina K L.Consolidation and mechanical properties of MoSi2-based materials[J].Materials Science and Engineering,1995,A192/193(2):881-890.
【5】Suzuki Y,Sekino T,Niihara K.Effect of ZrO2 addition on microstructure and mechanical properties of MoSi2[J].Scripta Metallurgica et Materialia,1995,33(1):69-74.
【6】Sun Lan,Pan Jinsheng.Fabrication and characterization of TiC-particle-reinforced MoSi2 composites[J].Journal of the European Ceramic society,2002,22(5):791-796.
【7】Zhang Houan,Wang Dezhi,Chen Chipping,et al.Toughing of MoSi2 doped by La2O3 particles[J].Materials Science and Engineering,2003,A345(1/2):118-121.
【8】Inui H,Ito K,Nakamoto T,et al.Stacking faults on (001) and their influence on the deformation and fracture behavior of single crystals of MoSi2-WSi2 solid-solutions with the C11b structure[J].Materials Science and Engineering,2001,A34(1/2):31-38.
【9】Ma Qin,Yang Yanqing,Kang Mokuang,et al.Microstucture and mechanical properties of hot-pressed MoSi2-matrix composites reinforced with SiC and ZrO2 particles[J].Composites Science and Technology,2001,61(7):963-969.
【10】Newman A,Sampath S,Herman H.Processing and properties of MoSi2/SiC and MoSi2/Al2O3[J].Materials Science and Engineering,1999,A261(1/2):252-260.
【11】Yamada K,Kamiya N.High temperature mechanical properties of Si3N4-MoSi2 and Si3N4-SiC composites with network structures of second phases[J].Materials Science and Engineering,1999,A261(1/2):270-277.
【12】Robert W K,Mohan G H.Cyclic oxidation study of MoSi2-Si3N4 base composites[J].Materials Science and Engineering,1999,A261(1/2):300-303.
【13】王学成,柴惠芬,王笑天.燃烧合成MoSi2的组织结构特征分析[J].中国有色金属学报,1995,5(2):103-107.
【14】Gang Wang,Wan Jiang,Guangzhao Bai,et al.Si3N4 rod-like crystal-reinforced MoSi2 matrix composites[J].Materials Letters,2004,58(3/4):308-331.
【15】马勤,杨延清,康沫狂.压痕法测定热压MoSi2基复合材料K1c值的研究[J].稀有金属材料与工程,1996,25(2):30-32.
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